Originally Posted by bgkast

Why not take just a little bit longer and fix it with real metal? Instead of wire brushing, cut around the rust with a cutting wheel (straight line segments are easiest) then do the same on a donor car (make sure you leave a few inches extra all the way around). Then place the your replacement part in the hole and cut it so it fits perfectly. Spot weld it in place, grind down the welds on the out side, seam seal and prep for paint. You should be able to get the replacement panel form a junk yard for about $20 (there are lots of 123s out there). Total time: 3 hrs or so (not including paint, but you still have to paint the filler too), and the car is as good as new.